The number of orbits used exceeds the number allocated David Golimowski (ACS Technical Lead) added 4 internal orbits to obtain contemporary WFC1-2K bias frames for calibration of science data from Visit 01. These orbits will be charged to the Cycle 22 ACS Calibration Program. 1589504869 ----- Attempting Submission 1 (Sun Jul 19 01:04:41 GMT 2015) ----- HST Phase II Proposal 14348 (14348_plan1.apt) successfully submitted. Receipt: # 14348-1 ----- Attempting Submission 2 (Wed Jul 22 15:19:22 GMT 2015) ----- ----- Attempting Submission 3 (Tue Jul 28 19:22:08 GMT 2015) ----- 4 internal calibration orbits are charged to ACS Cal Program, not to this proposal. Polarimetry of ASASSN-15lh as a probe of explosion physics of the most luminous supernova ever discovered Barring any viewing-angle dependencies, ASASSN-2015lh is the most superluminous supernova (SLSN) ever observed. An important key to the understanding of any type of object is its shape. At redshift 0.23, this rare event is still within reach of the imaging polarimetric capabilities of HST, even at relatively late epochs. Linear continuum polarization measured to 0.5% will yield deviations from sphericity at the 5% level. Observations at multiple epochs will probe the disintegrating star at increasing geometric depth and ultimately enable causal physical processes such as massive-star core-collapse and disruption of a star by a black hole to be decisively tensioned against each other. Interstellar foreground polarization can be subtracted as the remaining signal after the light curve has faded to the background level. Any polarization by circumstellar matter can be identified by its dependency on wavelength, time, and angle and may contribute critical information about the progenitor and late phases of its evolution. This program attempts to acquire imaging polarization of ASASSN-2015lh using ACS/WFC. We intend to observe at one epoch at around early August 2015. The polarization data will be observed in three filters: F435W, F606W, and F775W. For F606W and F775W, each filter three polarizers POL0V, POL120V, and POL60V are used to aqcuire a complete polarization data set. For F435W, the POLOUV, POL120UV, AND POL60UV will be used. Multiple exposures are required for cosmic ray rejection. CALIBRATION ORBITS: As per STScI policy, 4 internal orbits have been added to this proposal for the purpose of obtaining subarray bias frames that are contemporaneous with the science observations. These internal orbits will be charged to STScI's Cycle 22 ACS Calibration Program, not to GO 14348. The ACS Instrument Team at STScI is responsible for producing superbias reference files from the bias frames obtained in this GO proposal. 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